A tangle of power lines becomes a spider web, its gigantic maker dangling just out of sight. A public mural becomes a splatter of blood, lit as if by the flash of a crime scene camera. A university tower becomes a gothic lair, a mysterious light shining from a single high window. And that’s just for starters.

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The most frightening thought of all, however, is this: Halloween and its uniquely warped fun will be finished come tomorrow.

Enjoy it while you can.

Photo Key:

1. A large spider web (Park Street north of Chapel).2. A UFO (inside the main entrance to Yale’s Woolsey Hall).3. A gnarled, tentacled monster (near the entrance to Grove Street Cemetery).4. A dark tower (Yale’s Hall of Graduate Studies).5. Streaks of blood (detail of Felice Varini’s Square with four circles, a vast public mural stretching between Chapel Street and Temple Plaza).6. A flying witch or warlock (Crown and York Streets).7. Will-o’-wisps (scaffold lights along the north side of Yale’s Sterling Memorial Library).8. Giant bats (roofs of the permit parking lot on Crown Street between High and York).9. A second view of the gnarled, tentacled monster.